Mighty Monitor is a simple but useful desktop widget that displays the battery status for Apple's bluetooth keyboards and mice. Battery status is displayed as percent remaining. The widget status will change color to warn of low batteries - with a low status warning (yellow/orange) at less than 25% remaining, and alert (red) with less than 10% remaining.

MightyMonitor 5 allows customization of the device labels as well as warning (yellow) and critical (red) thresholds. MightyMonitor 5 also includes an enhanced battery view that will display full-time numeric status in addition to the battery indicator.